<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="jquery.min.js"></script>
    <script src="jQuery-bianli.js"></script>
    
    <title>Document</title>
    <style>
        .div {
            display: block;
            width: 500px;
            height: 200px;
            border: 2px solid pink;
        }
    </style>
    
</head>
<body>
    <div class="div">
        <p class="pra">今天要做的三件事：</p>
        <ul class="title">1111
            <li class="one">学习</li>
            <li class="two">学习</li>
            <li class="three">再学习</li>
        </ul>
    </div>
    <button class="parent">点击一下，找爸爸</button>
    <button class="children">点击一下，找儿孙</button>
</body>
</html>